A situation often encountered with thermodynamic data is that different sources may present different correlations for a given quantity. In this case study, for example, two different expressions are given for the equilibrium constant for the water–gas shift reaction, Equations 13.9 and 13.12. By what percentages do the conversions of CO and H and production of methanol differ if, instead of using Equation 13.12 in Problem 13.15(a), Equation 13.9 is used. Provide at least two reasons for the variations in the two equations for the water–gas shift equilibrium constant.

13.9

13.12

Problem 13.15(a)

a. As in Problems 13.13 and 13.14, suppose the synthesis gas leaving the MUG compressor is fed directly to theMSRand that the composition of this gas is 5 mole% methane, 25%CO, 5%CO₂, and the remainder hydrogen. The product stream leaving the MSR is at 250°C and 7.5 MPa and you may assume K_ϕ13.3 = K_ϕ13.5 = 0. Again determine the conversions of CO and H₂ with this process configuration, and use these results to justify utilization of the recycle loop.

1197.8 logio KP132 - 1.6485 %3D T(K)